Codex Micro: A Hardware Macro Keyboard for Steering OpenAI Codex

Melvin Vivas · X video post · 2026-07-15 · 2:14 · 124 views · Open on X

Topics: AI Dev Tools & Productivity · Level: beginner

Summary

Melvin Vivas jokingly quotes an OpenAI promo for the "Codex Micro" (kbd-1.0-codex-micro), a small macro keyboard made with Work Louder for controlling the Codex coding agent. His comment asks how many "Codex resets" it comes with. The demo builds a browser word game using only the device. Along the way it shows Codex workflow features: voice dictation, plan mode, a reasoning-effort setting, pinned parallel tasks, permission approvals and customizable skill shortcuts.

Key points

• The Codex Micro is a programmable keyboard built by OpenAI with Work Louder. It has keys, an analog stick and a dial, and you buy it from openai.com.
• You hold a key to dictate prompts to Codex by voice, so you don't need your laptop keyboard.
• By default, swiping the analog stick up turns on Codex plan mode. You can also map the stick to the skills you use most.
• The dial changes reasoning effort, so you can switch between quick tasks and deeper reasoning without breaking your flow.
• Each pinned Codex task maps to its own key. You press a key to switch tasks and can see at a glance what's running or needs attention. If the app is in the background, a double-tap shows what needs attention.
• When Codex asks for permission to run something, you can approve it from the device.
• Every control can be remapped to Codex actions, such as skills, creating a pull request or triggering your 'pet'.
• Demo prompt: build a browser game called 'One Letter Off'. Players turn 'cold' into 'warm' by changing one letter at a time, with a 30-second timer, streaks and tile animations. A follow-up prompt adds a punchier win state and a streak counter.

Resources mentioned

• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more
• Codex Micro · tool · openai.com · paid
  Something OpenAI announced for Codex in an OpenAI Devs post. The caption doesn't say what it is.
  Also in: Hardware Controller Mapped to OpenAI Codex (Thinking-Effort Knobs) (Melvin Vivas on X · notes)
• Work Louder · website · check price
  A hardware company that makes custom macro keyboards and co-built the Codex Micro.
• GPT 5.6 Luna · tool · openai.com · paid
  The OpenAI model used inside Codex for the demo. The transcript gives the variant name as 'Soul', which is unclear.
  Also in: Set Codex subagent model and reasoning to save usage limits (Melvin Vivas on X · notes), Use GPT-5.6 Luna in Codex for Terminal Tasks (Melvin Vivas on X · notes), Match Reasoning Effort to Task Length in Codex (Astra/Sol) (Melvin Vivas on X · notes), Run Coworker desktop agents cheaply with GPT-5.6 Luna on OpenRouter (Melvin Vivas on X · notes) and 24 more

Try this

• Optionally buy the Codex Micro on openai.com, as the promo says.
• Try Codex workflow features without the device: voice dictation, plan mode, reasoning-effort settings and pinned parallel tasks.
• Build 'One Letter Off', a browser word game where players turn 'cold' into 'warm' one letter at a time, with a 30-second timer, streaks, tile animations and a punchy win state.